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首页> 外文期刊>Indian Journal of Fibre & Textile Research >Effect of pH on the coloration of synthetic fibres with indigo blue
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Effect of pH on the coloration of synthetic fibres with indigo blue

机译：pH值对靛蓝合成纤维着色的影响

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摘要

Various synthetic fibres, viz. PET (polyethylene terephthalate), nylon 6.6, acrylic and lycra (polyurethane), have been dyed with indigo blue at various pH. The pH values are achieved by controlling the relative amounts of sodium dithionite and sodium hydroxide in the dyebath. PET, nylon 6.6, acrylic and lycra are dyed at 120, 100, 100 and 80 ℃ respectively for 30 min through an exhaust technique. The results show that leuco vat acid molecules exhaust well on all of these synthetic fibres in the appropriate acidic region (pH being 5.5 - 6). Lycra produces the highest shade depth followed by acrylic, nylon and then PET. On either side of this pH region, substantivity decreases. In the highly acidic region indigo molecules are precipitated while in the alkaline region dye molecules are ionized, and the fibre polymeric material is hydrolyzed. Reflection spectra show that the absorption maxima of indigo molecules are at 610 nm for PET, nylon and lycra while for acrylic it is 560 nm. It is also suggested that dye molecules exist as single molecules in the fibre matrix because when indigo is dissolved in dimethyl formamide it absorbs at 610 nm as well.
机译：各种合成纤维，即。 PET（聚对苯二甲酸乙二酯），尼龙6.6，丙烯酸和莱卡（聚氨酯）已在各种pH值下用靛蓝染色。通过控制染料浴中连二亚硫酸钠和氢氧化钠的相对量来获得pH值。通过排气技术将PET，尼龙6.6，丙烯酸和莱卡分别在120、100、100和80℃下染色30分钟。结果表明，无色还原酸分子在适当的酸性区域（pH值为5.5-6）中所有这些合成纤维上的排尽情况良好。莱卡产生最高的阴影深度，其次是丙烯酸，尼龙，然后是PET。在此pH区域的任一侧，直接性降低。在高酸性区域中，靛蓝分子沉淀，而在碱性区域中，染料分子被电离，并且纤维聚合物材料被水解。反射光谱表明，对于PET，尼龙和莱卡，靛蓝分子的最大吸收在610 nm，而对于丙烯酸，最大吸收在560 nm。还建议染料分子以单分子形式存在于纤维基质中，因为当靛蓝溶解在二甲基甲酰胺中时，它也在610 nm处吸收。

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